Konrad trobactt



(No Model.)

K. TROBACH, MANUFACTURE OF MANTLES FOR INOANDESGENT GAS LIGHTS. No.589,376. Patented Aug. 31,1897.

1 V. VE ZVTOR/ \s PETERS co. m-(ofouwa, wnsmumon, a c.

UNITED STATES PATENT OFFICE.

KONRAD TROllACll, OF PANKOW, GERMANY, ASSIGNOR TO MAX ARENDT,

OF BERLIN, GERMANY.

MANUFACTURE OF MANTLES FOR INCANDESCENT GAS-LIGHTS.

SPECIFICATION forming part of Letters Patent No. 589,376, dated August31, 1897.

Application filed January 80,1895. Renewed July 15,1897- Serial No.644,728. (No specimens. Patented in England January 12,1895,No. 811; inSwitzerland March 22, 1895, No. 10,287, and in Germany September 26,1896,1lo- 88,437.

To all whom it may concern.-

Be it known that I, KONRAD TROBACH, a subject of the King of Prussia,German Emperor, residing at Pankow, near Berlin, in

the Kingdom of Prussia, German Empire,

have invented certain new and useful Improvements in the Manufacture ofMantles for Incandescent Gas-Lights, (for which patents have alreadybeen obtained in England,

IO dated January 12, 1895, No. 811; in Germany, No. 88,437, datedSeptember 26, 1896, and in Switzerland, No. 10,287, dated March 22,1895,) of which the following is a specification.

I5 This invention relates to the manufacture of mantles for incandescentgas-lights, and more especially to a simplified manufacture of themantles, in which a peculiar struc-' tural formation is imparted to thecarbonized body used for the mantles, which body possesses thecharacteristic of having nearly the same flexibility, combined with anincreased absorbability, as that inherent to the original knit fabricfrom which the body of the mantle is made. The described result isaccomplished by partly carbonizing a knit blank by subjecting it to drydistillation un-' der exclusion of atmospheric air while hold-. ing itin distended form, then impregnating 0 the partly-carbonized blank witha solution of the salts of the refractory earths, then drying the blank,and, lastly, subjecting it to final carbonization in a distendedcondition under exclusion of air. As the carbonization' of I 3 5 theknit fabric takes place at a comparatively low temperature-that is tosay, at a temperature at which the knit structure which is used forproducing the mantle retains its flexibility and in a certain sense itscohesion, 40 together with an increased absorbability-the carbonizedstructure can be readily shipped, treated with the solution, andsubjected to the action of a non-illuminating heatingflame. Thedeformation of the carbonized structure is precluded while beingsubjected to the action of the heating-flame, as it is placed during thecarbonization of the knit structure on a suitable form, so that theshrinkage of the mantle is fully controlled, as will be more fullydescribed hereinafter.

According to my improved process the objectionable' and arbitrarydeformation of the mantle is avoided, as the textile structure ofthe'mantle is first carbonized on a form corresponding in shape theretoand in such a manner that the shrinkage of the structure during thecarbonization is fully controlled, then saturated, and, lastly, heated,so as to produce the mantle.

The invention further consists of a mold for carb onizing knit fabricsor blanks for the mantles of incandescent gas-lamps, which consists of aheating-burner of tubular form corresponding to the shape of the mantleto be produced, vsaid form being provided with an annular trough-shapedbase, means for supporting said form above the burner, a cover or hoodplaced over the form, and means for sealing the lower edge of the coveror hood in the annular base of the form. 70.

The accompanying drawing represents a vertical central section of myimproved device for producing the carbonization of the knit tube orblank for incandescent gasmantles.

The device consists of a lamp A, having a burner a, in which the flameis obtained by a mixture of air and gas under pressure. To the lamp A isapplied a sleeve 9 by means of a set-screw h. To the sleeve 9 isattached an annular support I), which is provided with openings at itslower part, so that the air can enter freely to the burner a. A hollowform .0, of sheet metal or suitable refractory material, is providedwith an annular troughshaped base f, that is attached to the support I).A hood or bell-shaped cover 6 is placed over the form, its lower edgebeing hermetically sealed into the annular trough f by means of apulverized refractory substancesuch as, for instance, pulverizedfire-brick or pulverized graphite.

The knit tube or blank for the mantle is placed loosely on the hollowform 0. The hood or cover 6 is placed over the same and closed tightlyat its lower end by means of the refractory substance. The burner a isthen lighted and the knit tube cl carbonized under exclusion ofatmospheric air and at a temperature of about 500 Celsius. The carboni-Ioo zation takes place in the gaseous products of combustion, which areretained in the space between the form and the cover 6-. As thecarbonization takes place at a comparatively low temperature underexclusion of atmospheric air, and as the carbonization in an atmosphereformed by the gaseous products of the dry distillation of the blank, theindividual threads or fibers of the blank become loosened and assume asponge-like character, so that a carbonized structure is obtained whichhas almost the same flexibility as that possessed by the threads orfibers of the blank. The so carbonized body is next impregnated with asolution of suitable salts, next dried, and then subjected to the heatof a non-luminous heating-flame, so that a cohesive ashy mantle isobtained which has exactly the same form and continuity as thecarbonized body, as during the second heating of the same no shrinkagecan take place, and as the sudden and objectionable generation ofgaseous products is obviated by the preceding carbonization of thestructure. I

It is obvious that the construction of the device for carbonizing theknit blanks can be readily changed without departing from the spirit ofthe present invention,which consists, mainly, in the avoidance ofdeformations in the mantles for incandescent gas-lights by substitutingin place of the impregnated structure which was heretofore used for, thesame a carbonized structure of exactly determinableform and retaining bythe novel treatment of the same the original flexibility of the tube orblank and the full absorptive capacity of the same.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The process herein described of making mantles forincandescent gas-lights, which consists in partly carbonizing a knitblank by subjecting it to dry distillation under exclusion ofatmospheric air while holding it in distended form, then impregnatingthe partlycarbonized blank with a solution of the salts of therefractory earths,then drying the blank and lastly subjecting it tofinal carbonization in distended condition under exclusion of air,substantially as set forth.

2. A mold for carbonizing knit fabrics or blanks for the mantles ofincandescent gaslights, which consists of a heating-burner of tubularform corresponding to the shape of the mantle to be produced, said formbeing provided with an annular trough-shaped base, means for supportingsaid form above the burner, a cover or hood placed over the form, andmeans for sealing the lower edge of the cover or hood in the annularbase of the form, substantially as set forth.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

KONRAD TROBACIT.

lVitnesses:

OnAs. Kniionn, \V. HAUP'r.

